180445490 has 8 divisors (see below), whose sum is σ = 324801900. Its totient is φ = 72178192.

The previous prime is 180445487. The next prime is 180445493. The reversal of 180445490 is 94544081.

It is a happy number.

180445490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 13433²+1.

It is an interprime number because it is at equal distance from previous prime (180445487) and next prime (180445493).

It can be written as a sum of positive squares in 2 ways, for example, as 180445489 + 1 = 13433^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×180445490² = 65121149722680200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 180445490.

It is not an unprimeable number, because it can be changed into a prime (180445493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9022265 + ... + 9022284.

Almost surely, 2^180445490 is an apocalyptic number.

180445490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

180445490 is a deficient number, since it is larger than the sum of its proper divisors (144356410).

180445490 is a wasteful number, since it uses less digits than its factorization.

180445490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044556.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 180445490 is about 13433.0000372218. Note that the first 4 decimals coincide. The cubic root of 180445490 is about 565.0870359561.

The spelling of 180445490 in words is "one hundred eighty million, four hundred forty-five thousand, four hundred ninety".